fogdog

/ˈfɑɡˌdɔɡ/
noun
  1. A bright or clear patch in fog, often seen as a gap or opening in the mist.
    • Hikers waited for a fogdog to show them the trail ahead.
    • A sudden fogdog appeared, revealing the coastline for a few moments.
    • The sailor spotted a fogdog and knew the fog would soon lift.
Synonyms
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